236Pu(n ,f ), 237Pu(n ,f ), and 238Pu(n ,f ) cross sections deduced from (p ,t ), (p ,d ), and (p ,p') surrogate reactions
Abstract
The 236Pu(n ,f ), 237Pu(n ,f ) and 238Pu(n ,f ) cross sections have been inferred by utilizing the surrogate ratio method. Targets of 239Pu and 235U were bombarded with 28.5-MeV protons, and the light ion recoils, as well as fission fragments, were detected using the STARS detector array at the K150 Cyclotron at the Texas A&M cyclotron facility. The (p , t f ) reaction on 239Pu and 235U targets was used to deduce the σ (236Pu(n ,f ))/σ (232U(n ,f )) ratio, and the 236Pu(n ,f ) cross section was subsequently determined for En=0.5 - 7.5 MeV. Similarly, the (p ,d f ) reaction on the same two targets was used to deduce the σ (237Pu(n ,f ))/σ (233U(n ,f )) ratio, and the 237Pu(n ,f ) cross section was extracted in the energy range En=0.5 - 7 MeV. The 238Pu(n ,f ) cross section was also deduced by utilizing the (p ,p') reaction channel on the same targets. There is good agreement with the recent ENDF/B-VII.1 evaluated cross section data for 238Pu(n ,f ) in the range En=0.5 - 10.5 MeV and for 237Pu(n ,f ) in the range En=0.5 -7 MeV; however, the 236Pu(n ,f ) cross section deduced in the present work is higher than the evaluation between 2 and 7 MeV.
- Publication:
-
Physical Review C
- Pub Date:
- July 2014
- DOI:
- 10.1103/PhysRevC.90.014304
- Bibcode:
- 2014PhRvC..90a4304H
- Keywords:
-
- 24.87.+y;
- 24.75.+i;
- 25.85.Ge;
- 25.55.Hp;
- Surrogate reactions;
- General properties of fission;
- Charged-particle-induced fission;
- Transfer reactions